<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/Home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片试图 -->
    <el-card>
        <!-- 提示区域 -->
        <el-alert
            title="添加商品信息"
            type="info"
            center
            show-icon
            :closable="false">
        </el-alert>
        <!-- 步骤条区域 -->
        <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
            <el-step title="基本信息"></el-step>
            <el-step title="商品参数"></el-step>
            <el-step title="商品属性"></el-step>
            <el-step title="商品图片"></el-step>
            <el-step title="商品内容"></el-step>
            <el-step title="完成"></el-step>
        </el-steps>

        <!-- tab栏区域 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
            
            <el-tabs v-model="activeIndex" :tab-position="'left'" 
                :before-leave="beforeTabLeave"
                @tab-click="tabClicked">
                <el-tab-pane label="基本信息" name="0">
                    <el-form-item label="商品名称" prop="goods_name">
                        <el-input v-model="addForm.goods_name"></el-input>
                    </el-form-item>
                    <el-form-item label="商品价格" prop="goods_price">
                        <el-input v-model="addForm.goods_price" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品重量" prop="goods_weight">
                        <el-input v-model="addForm.goods_weight"></el-input>
                    </el-form-item>
                    <el-form-item label="商品数量" prop="goods_number">
                        <el-input v-model="addForm.goods_number" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品分类" prop="goods_cat">
                        <el-cascader
                            v-model="addForm.goods_cat"
                            :options="catelist"
                            :props="cateProps"
                            @change="handleChange"></el-cascader>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品参数" name="1">
                    <!-- 渲染表单的Item项 -->
                    <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                        <!-- 复选框组 -->
                        <el-checkbox-group v-model="item.attr_vals">
                            <el-checkbox :label="cb" v-for="(cb,index) in item.attr_vals" :key="index" border></el-checkbox>
                        </el-checkbox-group>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品属性" name="2">
                    <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                        <el-input v-model="item.attr_vals"></el-input>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品图片" name="3">
                    <!-- action表示图片要上传到的后台API地址 -->
                    <!-- 上传组件没有主动调用axios请求，没有获得windows下的session，
                    所以要手动为其配置请求头headers获取windows下的session -->
                    <el-upload
                        :action="uploadURL"
                        :on-preview="handlePreview"
                        :on-remove="handleRemove"
                        list-type="picture"
                        :headers="headerObj"
                        :on-success="handleSuccess">
                        <el-button size="small" type="primary">点击上传</el-button>
                    </el-upload>
                </el-tab-pane>
                <el-tab-pane label="商品内容" name="4">
                    <!-- 富文本编辑器组件 -->
                    <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                    <!-- 添加商品的按钮 -->
                    <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                </el-tab-pane>
            </el-tabs>
        </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog
        title="图片预览"
        :visible.sync="previewVisible"
        width="50%">
        <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div> 
</template>

<script>
import _ from 'lodash'
export default {
    data(){
        return{
            activeIndex:'0',
            /* 添加商品的表单数据对象 */
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_weight:0,
                goods_number:0,
                /* 商品所属的分类数组 */
                goods_cat:[],
                /* 图片的数组 */
                pics:[],
                /* 商品的详情描述 */
                goods_introduce:'',
                attrs:[]
            },
            addFormRules:{
                goods_name:[
                    {required:true,message:'请输入商品名称',trigger:'blur'}
                ],
                goods_price:[
                    {required:true,message:'请输入商品价格',trigger:'blur'}
                ],
                goods_weight:[
                    {required:true,message:'请输入商品重量',trigger:'blur'}
                ],
                goods_number:[
                    {required:true,message:'请输入商品数量',trigger:'blur'}
                ],
                goods_cat:[
                    {required:true,message:'请选择商品分类',trigger:'blur'}
                ],
            },
            /* 商品分类列表 */
            catelist:[],
            cateProps:{
                label:'cat_name',
                value:'cat_id',
                children:'children',
                expandTrigger: 'hover'
            },
            /* 动态参数列表 */
            manyTableData:[],
            /* 静态属性列表 */
            onlyTableData:[],
            /* 上传图片的URL地址 */
            uploadURL:'https://lianghj.top:8888/api/private/v1/upload',
            /* 图片上传组件的headers请求头对象 */
            headerObj:{
                Authorization:window.sessionStorage.getItem('token')
            },
            previewPath:'',
            previewVisible:false,
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        /* 获取所有商品分类数据 */
        async getCateList(){
            const {data:res} = await this.$http.get('categories')

            if(res.meta.status!==200)
                return this.$message.error('获取商品分类数据失败！')

                this.catelist=res.data
                console.log(this.catelist)
        },
        /* 级联选择器选中项变化触发该函数 */
        handleChange(){
            if(this.addForm.goods_cat.length!==3)
                this.addForm.goods_cat=[]
        },
        beforeTabLeave(activeName,oldActiveName){
            if(oldActiveName==='0'&&this.addForm.goods_cat.length!==3){
                this.$message.error('请先选择商品分类！')
                return false;
            }
        },
        async tabClicked(){
            /* 访问动态参数面板 */
            if(this.activeIndex==='1'){
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{sel:'many'}
                })

                if(res.meta.status!=200)
                    return this.$message.error('获取动态参数列表失败！')

                console.log(res.data)
                res.data.forEach(item=>{
                    item.attr_vals=item.attr_vals.length===0?[]:item.attr_vals.split(' ')
                })
                this.manyTableData=res.data
            }
            else if(this.activeIndex==='2'){
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{sel:'only'}
                })

                if(res.meta.status!==200){
                    return this.$message.error('获取静态数据失败！')
                }

                console.log(res.data)
                this.onlyTableData=res.data
            }
        },
        /* 处理图片预览效果 */
        handlePreview(file){
            this.previewPath=file.response.data.url
            this.previewVisible=true
        },
        /* 处理移除图片的操作 */
        handleRemove(file){
            console.log(file)
            /* 1.获取将要删除的图片的临时路径 */
            const filePath=file.response.data.tmp_path
            /* 2.从pics数组中找到这个图片对应的索引值 */
            const i = this.addForm.pics.findIndex(x =>
                x.pic===filePath)
            /* 3.调用数组的splic方法，把图片信息对象从pics数组中移除 */
            this.addForm.pics.splice(i,1)
            console.log(this.addForm)
        },
        /* 监听图片上传成功的事件 */
        handleSuccess(response){
            /* 1.拼接得到一个图片信息对象 */
            const picInfo={pic:response.data.tmp_path}
            /* 2.将图片信 对象push到pics数组中 */
            this.addForm.pics.push(picInfo)
            console.log(this.addForm.pics)
        },
        /* 添加商品 */
        add(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid){
                    return this.$message.error('请填写必要的表单项!')
                }
                /* 执行添加的业务逻辑 */
                /* 用lodash，深拷贝到form */
                const form = _.cloneDeep(this.addForm)
                form.goods_cat=form.goods_cat.join(',')
                /* 处理动态参数 */
                this.manyTableData.forEach(item=>{
                    const newInfo={
                        attr_id:item.attr_id,
                        attr_value:item.attr_vals.join(' ')
                    }
                    this.addForm.attrs.push(newInfo)
                })
                /* 处理静态属性 */
                this.onlyTableData.forEach(item=>{
                    const newInfo={
                        attr_id:item.attr_id,
                        attr_value:item.attr_vals
                    }
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs=this.addForm.attrs
                console.log(form)

                /* 发起请求添加商品 */
                /* 商品的名称必须是唯一的 */
                const {data:res} = await this.$http.post('goods',form)

                console.log(res.meta)
                if(res.meta.status!==201)
                    return this.$message.error("添加商品失败！")
                this.$message.success("添加商品成功！")
                this.$router.push('/goods')
            })
        }
    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length===3){
                return this.addForm.goods_cat[2]
            }
            else{
                return null;
            }
        }
    }
}
</script>

<style scoped>
.el-checkbox{
    margin: 0 10px 0 0 !important;
}
.previewImg{
    width:100%
}
.btnAdd{
    margin-top: 15px;
}
</style>